[Dovecot] imap sent-mail folder sometimes dosen't get updated when used by more than a mailer at the same time.

Hi, I'm collecting users feedback of latest dovecot 1.1.rc3 development release.

Some users are complaining that their sent mails sometimes don't get written to imap Sent-mail folder.

It seems that all these users were using multiple istances of imap processes to read their mail (thunderbird+horde-imp, evolution+horde-imp or multiple thunderbird istances).

No error message is written in dovecot.log, no user feedback in horde-imp/evolution. Only thunderbird says it can't update Sent folder.

Has anyone had similar issues?

Diego.